Audible Bases

Siemens ABHW-4 intelligent audible bases include the ABHW-4B and ABHW-4S bases. Both models offer new and innovative features.

The model ABHW-4S is the first UL-listed sounder base to provide a low frequency (520 Hz square wave) tone, specifically designed for sleeping areas. Additionally, the ABHW-4S meets all NFPA signaling requirements for low frequency sounders designated for sleeping areas.

The model ABHW-4B is the first and only UL-approved sounder base to offer a loop powered (2-wire) option with a standard frequency (3Khz) tone. This loop powered feature is very beneficial for add-on and retrofit applications allowing for a lower hardware and installation cost with minimum wiring.

When used with Cerberus® PRO or Desigo® Fire Safety detectors, both bases also offer tones individually controlled by the audible base.

Both ABHW-4 bases offer six (6) selectable tone patterns:

Temporal 3

Temporal 4

Steady

March time 30

March time 120

Low power option

The ABHW-4S (520 Hz) detector sounder base is the first UL/ULC listed audible (sounder) base in the market complying with the latest NFPA code requirements for low frequency sounders to be provided in sleeping areas by incorporating a 520 Hz square wave audible tone.

Instead of having to use a separate audible sounder device, the ABHW-4S provides a self-contained solution to meet these requirements, (smoke, heat, CO + low frequency sounder base combined) making for a smaller footprint on the wall or ceiling and simpler, more aesthetically pleasing and lower cost solution.

Currently, approximately 20 states and several counties in other states have adopted the new code with additional adoptions growing rapidly. Applications for low frequency sounder bases include:

The ABHW-4S is an intelligent, addressable low frequency sounder base, specifically designed for use in sleeping areas and anywhere that a 520Hz (improved sound) is desired or specified. The ABHW-4S is UL/ULC listed and meets the current requirements of NFPA 72 and the future NFPA 720 (CO - carbon monoxide) code for inclusion of a 520 Hz tone when CO detectors are used in sleeping areas. This code goes into effect January 1, 2015.